Relationship of PMBL to Hodgkin lymphoma. Relative gene expression is shown in primary PMBLs (average of all biopsy samples), the PMBL cell line K1106, 3 Hodgkin lymphoma cell lines, and 6 GCB DLBCL cell lines. Red represents high gene expression and green low expression. PMBL signature genes that are also expressed at high levels in Hodgkin lymphoma cell lines compared with GCB DLBCL cell lines. (Figure courtesy of Louis Staudt.)